/* ==========================================================================
   Professor Humberto — Matemática  ·  assets/css/style.css
   CSS puro, mobile-first, sem frameworks.
   Para alterar cores e fontes, edite as variáveis em :root.
   Sugestão de minificação: https://cssminifier.com (gera style.min.css)
   ========================================================================== */

/* ---------- 1. Variáveis (identidade visual) ---------- */
:root {
    /* Base */
    --c-bg:          #fbfaf6;   /* off-white */
    --c-surface:     #ffffff;
    --c-alt:         #f1f5f4;   /* seções alternadas */
    --c-text:        #1b2733;
    --c-muted:       #52606d;
    --c-line:        #dde4ea;

    /* Primária: azul-marinho acadêmico */
    --c-primary:     #0b2e4f;
    --c-primary-700: #123e68;
    --c-primary-100: #e4edf5;

    /* Destaque (CTAs): âmbar quente + verde WhatsApp */
    --c-accent:        #f5b301;
    --c-accent-strong: #d99500;
    --c-wa:            #0e7a43;
    --c-wa-dark:       #0a5f34;

    --c-focus:       #1d6fd8;

    /* Tipografia */
    --f-body:    'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
    --f-display: 'Sora', 'Inter', system-ui, sans-serif;

    /* Medidas */
    --radius:   14px;
    --radius-sm: 8px;
    --shadow:   0 1px 2px rgba(11,46,79,.06), 0 8px 24px rgba(11,46,79,.08);
    --container: 1120px;
    --header-h: 68px;
}

/* ---------- 2. Reset e base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: var(--f-body);
    font-size: 1.0625rem;
    line-height: 1.65;
    color: var(--c-text);
    background: var(--c-bg);
    overflow-x: hidden;
}
img, svg { max-width: 100%; height: auto; }
img { display: block; }
h1, h2, h3 { font-family: var(--f-display); line-height: 1.2; color: var(--c-primary); margin: 0 0 .6em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 5.2vw, 3.2rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3.4vw, 2.25rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 600; }
h3 small { display: block; font-family: var(--f-body); font-weight: 500; color: var(--c-muted); font-size: .85rem; margin-top: .15rem; }
p { margin: 0 0 1em; }
a { color: var(--c-primary-700); text-underline-offset: 3px; }
a:hover { color: var(--c-primary); }
ul, ol { margin: 0; padding: 0; }
main { display: block; }

:focus-visible { outline: 3px solid var(--c-focus); outline-offset: 3px; border-radius: 4px; }

.container { width: min(100% - 2.5rem, var(--container)); margin-inline: auto; }
.container-narrow { width: min(100% - 2.5rem, 820px); }
.center { text-align: center; }
.muted { color: var(--c-muted); }

.skip-link {
    position: absolute; left: 1rem; top: -4rem; z-index: 200;
    background: var(--c-primary); color: #fff; padding: .6rem 1rem; border-radius: var(--radius-sm);
}
.skip-link:focus { top: .75rem; color: #fff; }

/* ---------- 3. Fundo de papel quadriculado (sutil) ---------- */
.paper {
    background-color: var(--c-bg);
    background-image:
        linear-gradient(rgba(11,46,79,.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(11,46,79,.055) 1px, transparent 1px);
    background-size: 28px 28px;
}
.paper-dark {
    background-image:
        linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
    background-size: 28px 28px;
}

/* ---------- 4. Botões ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
    padding: .8rem 1.4rem; border-radius: 999px; border: 2px solid transparent;
    font: 600 1rem/1.2 var(--f-body); text-decoration: none; cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(11,46,79,.18); }
.btn:active { transform: translateY(0); }
.btn-lg { padding: 1rem 1.7rem; font-size: 1.05rem; }
.btn-sm { padding: .55rem 1.1rem; font-size: .95rem; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-700); color: #fff; }
.btn-wa { background: var(--c-wa); color: #fff; }
.btn-wa:hover { background: var(--c-wa-dark); color: #fff; }
.btn-accent { background: var(--c-accent); color: #1b1400; }
.btn-accent:hover { background: #ffc61f; color: #1b1400; }
.btn-outline { background: transparent; color: var(--c-primary); border-color: var(--c-primary); }
.btn-outline:hover { background: var(--c-primary); color: #fff; }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.7); }
.btn-ghost:hover { background: #fff; color: var(--c-primary); }

/* ---------- 5. Ícones ---------- */
.icon { width: 1.25em; height: 1.25em; flex: none; vertical-align: -.2em; }
.icon-lg { width: 2.25rem; height: 2.25rem; color: var(--c-primary-700); }
.icon-xl { width: 3.5rem; height: 3.5rem; }

/* ---------- 6. Cabeçalho fixo ---------- */
.site-header {
    position: sticky; top: 0; z-index: 100; height: var(--header-h);
    background: rgba(251,250,246,.92); backdrop-filter: saturate(1.4) blur(10px);
    border-bottom: 1px solid var(--c-line);
    transition: box-shadow .2s ease;
}
.site-header.is-scrolled { box-shadow: 0 4px 18px rgba(11,46,79,.1); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; gap: 1rem; }

.logo { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; color: var(--c-primary); }
.logo-mark {
    display: inline-grid; place-items: center; width: 2.4rem; height: 2.4rem; border-radius: 10px;
    background: var(--c-primary); color: var(--c-accent); font: 700 1.5rem/1 Georgia, 'Times New Roman', serif;
}
.logo-text { display: flex; flex-direction: column; line-height: 1.15; }
.logo-text strong { font-family: var(--f-display); font-size: 1.05rem; }
.logo-text small { font-size: .72rem; color: var(--c-muted); }

.nav-toggle { display: inline-grid; place-items: center; width: 2.75rem; height: 2.75rem; border: 1px solid var(--c-line); border-radius: 10px; background: #fff; color: var(--c-primary); cursor: pointer; }
.nav-toggle .icon { width: 1.5rem; height: 1.5rem; }
.nav-toggle .icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-menu { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: inline; }

/* Menu mobile (padrão) */
.nav {
    position: absolute; left: 0; right: 0; top: var(--header-h);
    display: none; flex-direction: column; gap: 1rem; padding: 1rem 1.25rem 1.5rem;
    background: var(--c-bg); border-bottom: 1px solid var(--c-line); box-shadow: 0 14px 24px rgba(11,46,79,.1);
}
.nav.is-open { display: flex; }
.nav ul { list-style: none; display: flex; flex-direction: column; }
.nav li a { display: block; padding: .8rem .25rem; text-decoration: none; color: var(--c-text); font-weight: 500; border-bottom: 1px solid var(--c-line); }
.nav li a:hover, .nav li a[aria-current="page"] { color: var(--c-primary); font-weight: 600; }

/* ---------- 7. Hero ---------- */
.hero { position: relative; overflow: hidden; padding: clamp(2.5rem, 7vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4.5rem); }
/* O container ocupa a largura toda (alinha com o logo); só o texto é limitado a 700px */
.hero-inner { position: relative; z-index: 1; }
.hero-inner > * { max-width: 700px; }
.hero-art {
    position: absolute; right: -90px; top: 50%; width: 560px; transform: translateY(-50%);
    color: var(--c-primary); opacity: .1; pointer-events: none;
}
.eyebrow { font: 600 .82rem/1 var(--f-body); letter-spacing: .12em; text-transform: uppercase; color: var(--c-primary-700); margin-bottom: 1rem; }
.lead { font-size: clamp(1.05rem, 2.2vw, 1.25rem); color: var(--c-muted); max-width: 62ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .85rem; margin: 1.6rem 0 1.4rem; }
.hero-actions-center { justify-content: center; }
.hero-points { list-style: none; display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; color: var(--c-primary); font-weight: 500; font-size: .95rem; }
.hero-points .icon { color: var(--c-wa); }

/* ---------- 8. Seções genéricas ---------- */
.section { padding: clamp(2.75rem, 7vw, 5rem) 0; }
.section-alt { background-color: var(--c-alt); }
.section-head { max-width: 720px; margin: 0 auto 2.25rem; text-align: center; }
.section-head p:last-child { margin-bottom: 0; color: var(--c-muted); }
.section-dark { background-color: var(--c-primary); color: #dbe7f2; }
.section-dark h2, .section-dark h3 { color: #fff; }
.section-dark .eyebrow { color: var(--c-accent); }
.section-dark .section-head p { color: #dbe7f2; }

.page-hero { padding: clamp(2rem, 5vw, 3.5rem) 0; border-bottom: 1px solid var(--c-line); }
.breadcrumb { font-size: .9rem; color: var(--c-muted); margin-bottom: 1rem; }
.breadcrumb a { color: var(--c-muted); }

/* ---------- 9. Grid e cartões ---------- */
.grid { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
.card {
    background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius);
    padding: 1.5rem; box-shadow: var(--shadow); margin: 0;
}
.card h2, .card h3 { margin-bottom: .45em; }
.card p:last-child { margin-bottom: 0; }

.highlights { margin-top: -1.75rem; position: relative; z-index: 2; padding-bottom: 1rem; }
.highlight { text-align: left; }
.highlight h2 { font-size: 1.1rem; margin-top: .75rem; }
.highlight p { color: var(--c-muted); font-size: .95rem; }

.split { display: grid; gap: 2rem; align-items: center; }
.portrait { margin: 0; }
.portrait img {
    width: 100%; max-width: 420px; margin-inline: auto; border-radius: var(--radius);
    box-shadow: var(--shadow); background: var(--c-primary-100); aspect-ratio: 480 / 560; object-fit: cover;
}

.check-list { list-style: none; display: grid; gap: .55rem; margin: 1rem 0 1.25rem; }
.check-list li { display: flex; gap: .6rem; align-items: flex-start; }
.check-list .icon { color: var(--c-wa); margin-top: .22em; }

/* ---------- 10. Passos ---------- */
.steps { list-style: none; display: grid; gap: 1.25rem; grid-template-columns: 1fr; counter-reset: passo; }
.step {
    position: relative; background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius);
    padding: 1.5rem 1.5rem 1.5rem 1.5rem; box-shadow: var(--shadow);
}
.step-num {
    display: inline-grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%;
    background: var(--c-accent); color: #1b1400; font: 800 1.2rem/1 var(--f-display); margin-bottom: .8rem;
}
.step p { color: var(--c-muted); margin: 0; }

/* ---------- 11. Metodologia ---------- */
.method {
    padding: 1.5rem; border: 1px solid rgba(255,255,255,.18); border-radius: var(--radius);
    background: rgba(255,255,255,.05);
}
.method h3 { margin-bottom: .4em; }
.method p { margin: 0; color: #dbe7f2; }
.method-symbol { display: block; font: 400 2.4rem/1 Georgia, 'Times New Roman', serif; color: var(--c-accent); margin-bottom: .5rem; }

/* ---------- 12. Depoimentos ---------- */
.testimonial { display: flex; flex-direction: column; gap: .75rem; }
.testimonial blockquote { margin: 0; flex: 1; }
.testimonial blockquote p { margin: 0; font-size: 1rem; }
.testimonial figcaption { font-size: .92rem; color: var(--c-muted); }
.testimonial figcaption strong { color: var(--c-text); }
.stars { display: inline-flex; gap: 2px; }
.star { width: 1.15rem; height: 1.15rem; color: #cfd6dd; fill: currentColor; }
.star.is-on { color: #f2a900; }

/* ---------- 13. FAQ ---------- */
.faq { display: grid; gap: .75rem; }
.faq-item { background: var(--c-surface); border: 1px solid var(--c-line); border-radius: var(--radius-sm); }
.faq-item summary {
    cursor: pointer; list-style: none; padding: 1rem 3rem 1rem 1.15rem; font-weight: 600; color: var(--c-primary); position: relative;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
    content: '+'; position: absolute; right: 1.1rem; top: 50%; transform: translateY(-50%);
    font: 400 1.5rem/1 var(--f-body); color: var(--c-primary-700);
}
.faq-item[open] summary::after { content: '–'; }
.faq-item p { padding: 0 1.15rem 1.1rem; margin: 0; color: var(--c-muted); }

/* ---------- 14. CTA final ---------- */
.cta-final { background-color: var(--c-primary); color: #dbe7f2; padding: clamp(2.75rem, 7vw, 4.5rem) 0; }
.cta-final h2 { color: #fff; }
.cta-final p { max-width: 56ch; margin-inline: auto; }

/* ---------- 15. Serviços e planos ---------- */
.services { display: grid; gap: 1.25rem; grid-template-columns: 1fr; }
.service-head { display: flex; align-items: center; gap: .9rem; margin-bottom: .6rem; }
.service-head h2 { font-size: 1.2rem; margin: 0; }
.plan { position: relative; display: flex; flex-direction: column; gap: .25rem; }
.plan .check-list { flex: 1; }
.plan-featured { border: 2px solid var(--c-primary); }
.badge {
    position: absolute; top: -.8rem; left: 1.25rem; background: var(--c-accent); color: #1b1400;
    font: 700 .75rem/1 var(--f-body); padding: .4rem .75rem; border-radius: 999px; letter-spacing: .03em;
}
.big-check { display: inline-grid; place-items: center; width: 5rem; height: 5rem; border-radius: 50%; background: #e3f4ea; color: var(--c-wa); margin-bottom: 1rem; }

/* ---------- 16. Contato / formulário ---------- */
.contact-grid { display: grid; gap: 1.5rem; }
.contact-side { display: grid; gap: 1.25rem; align-content: start; }
.field { display: grid; gap: .35rem; margin-bottom: 1rem; }
.field-row { display: grid; gap: 0 1rem; }
label { font-weight: 600; font-size: .95rem; color: var(--c-primary); }
input[type="text"], select, textarea {
    width: 100%; padding: .8rem .9rem; font: inherit; color: var(--c-text);
    background: #fff; border: 1.5px solid #b9c4ce; border-radius: var(--radius-sm);
}
input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--c-focus); outline-offset: 1px; border-color: var(--c-focus); }
[aria-invalid="true"] { border-color: #b3261e; }
.field-error { color: #b3261e; font-size: .88rem; margin: 0; font-weight: 500; }
.field-check { grid-template-columns: auto 1fr; align-items: start; column-gap: .6rem; }
.field-check label { font-weight: 400; color: var(--c-text); font-size: .92rem; }
.field-check input { width: 1.15rem; height: 1.15rem; margin-top: .2rem; }
.field-check .field-error { grid-column: 1 / -1; }
.alert { padding: .85rem 1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-weight: 500; }
.alert-error { background: #fdeceb; color: #8c1d18; border: 1px solid #f3b9b5; }
/* Honeypot: fora da tela (não use display:none, alguns bots detectam) */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.contact-list { gap: .75rem; }

/* ---------- 17. Texto corrido (políticas) ---------- */
.prose h2 { margin-top: 2rem; }
.prose h3 { margin-top: 1.4rem; font-size: 1.05rem; }
.prose ul { padding-left: 1.2rem; margin-bottom: 1em; }
.prose li { margin-bottom: .4rem; }

/* ---------- 18. Rodapé ---------- */
.site-footer { background-color: #081f36; color: #c9d6e2; padding-top: 3rem; }
.site-footer a { color: #fff; }
.site-footer a:hover { color: var(--c-accent); }
.footer-grid { display: grid; gap: 2rem; grid-template-columns: 1fr; padding-bottom: 2rem; }
.footer-brand { display: flex; align-items: center; gap: .6rem; font: 700 1.15rem/1 var(--f-display); color: #fff; margin-bottom: 1rem; }
.footer-title { font-size: 1rem; color: #fff; margin-bottom: .9rem; }
.footer-list { list-style: none; display: grid; gap: .55rem; font-size: .97rem; }
.footer-list .icon { color: var(--c-accent); margin-right: .25rem; }
.footer-areas li { font-size: .92rem; }
.social { list-style: none; display: flex; gap: .6rem; }
.social a { display: grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%; background: rgba(255,255,255,.1); }
.social a:hover { background: var(--c-accent); color: #1b1400; }
.footer-map { padding-bottom: 2rem; }
.footer-map iframe { border-radius: var(--radius); background: #0d2c4a; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 1.1rem 0; font-size: .88rem; }
.footer-bottom-inner { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; justify-content: space-between; }
.footer-bottom p { margin: 0; }

/* ---------- 19. Botão flutuante de WhatsApp ---------- */
.wa-float {
    position: fixed; right: 1rem; bottom: 1rem; z-index: 150;
    display: inline-flex; align-items: center; gap: .5rem; padding: .85rem 1.05rem;
    background: var(--c-wa); color: #fff; border-radius: 999px; text-decoration: none; font-weight: 600;
    box-shadow: 0 8px 22px rgba(0,0,0,.28);
    transition: transform .15s ease, background-color .15s ease;
}
.wa-float:hover { background: var(--c-wa-dark); color: #fff; transform: translateY(-2px); }
.wa-float .icon { width: 1.6rem; height: 1.6rem; }
.wa-float-text { display: none; }

/* ---------- 20. Animações sutis (só com JS ativo) ---------- */
.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition: none !important; animation: none !important; }
    .js .reveal { opacity: 1; transform: none; }
}

/* ---------- 21. Telas maiores ---------- */
@media (min-width: 640px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .field-row { grid-template-columns: 1fr 1fr; }
    .wa-float-text { display: inline; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
    .nav-toggle { display: none; }
    .nav { position: static; display: flex; flex-direction: row; align-items: center; gap: 1.25rem; padding: 0; background: none; border: 0; box-shadow: none; }
    .nav ul { flex-direction: row; gap: .25rem; }
    .nav li a { border: 0; padding: .5rem .75rem; border-radius: 999px; }
    .nav li a:hover, .nav li a[aria-current="page"] { background: var(--c-primary-100); }

    .grid-3 { grid-template-columns: repeat(3, 1fr); }
    .grid-4 { grid-template-columns: repeat(4, 1fr); }
    .steps { grid-template-columns: repeat(4, 1fr); }
    .split { grid-template-columns: 5fr 7fr; gap: 3.5rem; }
    .services { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 7fr 5fr; align-items: start; }
    .footer-grid { grid-template-columns: 1.4fr 1.1fr .8fr 1.2fr; }
    .hero-art { right: -20px; opacity: .13; width: 600px; }
}

@media (max-width: 899px) {
    .hero-art { opacity: .07; }
}